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Provides excellent biological filtration. Great to have more then one in a filter especially if you plan to setup a new tank, because it is super easy to move one over to a new tank to provide a very quick cycle. They never need replaced, and do not require a lot of cleaning if any.

I began using Biomax when I first started up my AC30 three months ago. Since then, I purchased more and added it to the small amount that came with the filter - it is now stuffed quite full of Biomax. The older units certainly darken with age which I assume is due to the growth of the bio load. Be sure to rinse these well prior to first using them. A portion of them get powdered like cereal in shipping. I haven't seen any reason to re-clean or replace them yet, nor do I expect to. My Eheim canister filter came with biofiltration in the form of pea-sized spheres. I suspect that shape will lead to denser packing of the media and less damage from shipping (no edges). Most likely, I will buy some Fluval product next just so I can see all three types in action.